The Scofield Bible Commentary, by Cyrus Ingerson Scofield, [1917], at sacred-texts.com
2 Corinthians Chapter 12
third heaven
First heaven, of clouds;
second heaven, of stars;
third heaven, God's abode.
paradise
See note on hades,
(See Scofield) - (Luk 16:23).
thorn
It has been conjectured that Paul's "thorn in the flesh" was chronic ophthalmia, inducing bodily weakness, and a repulsive appearance (Gal 4:15); (Co1 2:3); (Co1 2:4); (Co2 10:10). This cannot be positively known, and the reserve of Scripture is as sure a mark of inspiration as its revelations. Paul's particular "thorn" is not described that his consolations may avail for all to who any thorn is given.
perfect in
(See Scofield) - (Mat 5:48).
sinned
Sin
(See Scofield) - (Rom 3:23).